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Earth's Magnetism

A large solen...

Question

A large solenoid of windings of 400 turns per meter carries a current 5A. The magnetic field at the centre of the solenoid is about:

A

1.2 mT

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B

zero

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C

5.0 mT

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D

2.5 mT

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Solution

The correct option is D 2.5 mT
The magnetic field at the centre of the solenoid $= μ n I = 4 π \times 10^{- 7} \times 400 \times 5 = 2.5 \times 10^{- 3} T$
Therefore, D is correct option.

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